From 5e22ff90453eddb36aa16f0b2f6543a618bfac14 Mon Sep 17 00:00:00 2001
From: Takeshi KOMIYA <i.tkomiya@gmail.com>
Date: Wed, 29 Aug 2018 23:56:05 +0900
Subject: [PATCH] Fix #5361: crashed on incremental build if document uses
 include directive

---
 CHANGES                        | 2 ++
 sphinx/environment/__init__.py | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index cde111a01..08708eb80 100644
--- a/CHANGES
+++ b/CHANGES
@@ -18,6 +18,8 @@ Features added
 Bugs fixed
 ----------
 
+* #5361: crashed on incremental build if document uses include directive
+
 Testing
 --------
 
diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py
index 2a48e5b4e..d5479d46f 100644
--- a/sphinx/environment/__init__.py
+++ b/sphinx/environment/__init__.py
@@ -72,7 +72,7 @@ default_settings = {
 # or changed to properly invalidate pickle files.
 #
 # NOTE: increase base version by 2 to have distinct numbers for Py2 and 3
-ENV_VERSION = 52 + (sys.version_info[0] - 2)
+ENV_VERSION = 54 + (sys.version_info[0] - 2)
 
 
 versioning_conditions = {